diff --git a/.plzconfig b/.plzconfig
index ccd6eff3c5..56197a6691 100644
--- a/.plzconfig
+++ b/.plzconfig
@@ -11,6 +11,7 @@ importpath = github.com/thought-machine/please
 gotool = //third_party/go:toolchain|go
 FeatureFlags = go_get
 ModFile = //:mod
+RequireLicences = true
 
 [Plugin "cc"]
 target = //plugins:cc
@@ -87,5 +88,7 @@ accept = MPL-2.0
 accept = LGPL
 accept = Artistic License
 accept = ISC
+accept = CC0-1.0
+accept = LGPL-3.0
 # Not really a licence, but Bazel projects commonly describe things this way.
 accept = notice
\ No newline at end of file
diff --git a/BUILD b/BUILD
index e69561d2f9..8ca5f23ddb 100644
--- a/BUILD
+++ b/BUILD
@@ -49,4 +49,4 @@ filegroup(
     name = "mod",
     srcs = ["go.mod"],
     visibility = ["//third_party/go/..."],
-)
\ No newline at end of file
+)
diff --git a/test/text_file/BUILD b/test/text_file/BUILD
index b885e232cd..78fdc91697 100644
--- a/test/text_file/BUILD
+++ b/test/text_file/BUILD
@@ -12,7 +12,7 @@ text_file(
         use strip option to remove first empty newline
         and all empty spaces on the left of the text.
         t - t should not be stripped
-        \ - nor backslash
+        \\ - nor backslash
     """,
     strip = True,
 )
diff --git a/third_party/go/BUILD b/third_party/go/BUILD
index d94129f851..074a997cda 100644
--- a/third_party/go/BUILD
+++ b/third_party/go/BUILD
@@ -20,559 +20,659 @@ go_stdlib(
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "gopkg.in/op/go-logging.v1",
     version = "v1.0.0-20160211212156-b2cb9fa56473",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/text",
     version = "v0.13.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/tools",
     version = "v0.6.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/yuin/goldmark",
     version = "v1.6.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/x1ddos/csslex",
     version = "v0.0.0-20160125172232-7894d8ab8bfe",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/matttproud/golang_protobuf_extensions",
     requirements = ["github.com/golang/protobuf"],
     version = "v1.0.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/shirou/gopsutil/v3",
     version = "v3.22.6",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/chzyer/readline",
     version = "v0.0.0-20180603132655-2972be24d48e",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/coreos/go-semver",
     version = "v0.3.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/Masterminds/semver/v3",
     version = "v3.1.1",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/stretchr/testify",
     version = "v1.8.4",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/peterebden/go-cli-init/v5",
     version = "v5.2.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "gopkg.in/yaml.v3",
     version = "v3.0.1",
 )
 
 go_repo(
+    licences = [
+        "MIT",
+        "Apache-2.0",
+        "BSD-3-Clause",
+    ],
     module = "github.com/klauspost/compress",
     version = "v1.15.11",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/jellydator/ttlcache/v2",
     version = "v2.11.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/please-build/gcfg",
     version = "v1.6.1-0.20220308170049-10ea9d657afb",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/ProtonMail/go-crypto",
     version = "v0.0.0-20210920135941-2c5829bbf927",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/net",
     version = "v0.17.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/prometheus/client_model",
     version = "v0.3.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/peterebden/go-sri",
     version = "v1.1.1",
 )
 
 go_repo(
+    licences = ["CC0-1.0"],
     module = "github.com/zeebo/blake3",
     version = "v0.2.3",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/thought-machine/go-flags",
     version = "v1.6.2",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/theupdateframework/go-tuf",
     version = "v0.5.2-0.20220930112810-3890c1e7ace4",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/oauth2",
     version = "v0.7.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/google/shlex",
     version = "v0.0.0-20181106134648-c34317bd91bf",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/mostynb/zstdpool-syncpool",
     version = "v0.0.7",
 )
 
 go_repo(
-    module = "github.com/peterebden/buildtools",
-    version = "f7a36c689cc9e038956d51005332c67ade7aa9c6",
-)
-
-go_repo(
+    licences = ["Apache-2.0"],
     module = "google.golang.org/genproto",
     version = "v0.0.0-20230124163310-31e0e69b6fc2",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/djherbis/atime",
     version = "v1.1.0",
 )
 
 go_repo(
+    licences = ["MPL-2.0"],
     module = "github.com/hashicorp/go-retryablehttp",
     version = "v0.7.2",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/texttheater/golang-levenshtein",
     version = "v1.0.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/golang/snappy",
     version = "v0.0.3",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/tklauser/go-sysconf",
     version = "v0.3.9",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/ulikunitz/xz",
     version = "v0.5.10",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/mattn/go-isatty",
     version = "v0.0.16",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/google/go-containerregistry",
     version = "v0.12.1",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/tklauser/numcpus",
     version = "v0.3.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/prometheus/client_golang",
     version = "v1.13.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/lunixbochs/vtclean",
     version = "v1.0.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/term",
     version = "v0.13.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/google/go-cmp",
     version = "v0.5.9",
 )
 
 go_repo(
+    licences = ["MPL-2.0"],
     module = "github.com/hashicorp/go-multierror",
     version = "v1.1.1",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/grpc-ecosystem/go-grpc-middleware",
     version = "v1.3.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/pborman/uuid",
     version = "v1.2.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/sigstore/sigstore",
     version = "v1.5.0",
 )
 
 go_repo(
+    licences = ["BSD-2-Clause"],
     module = "gopkg.in/warnings.v0",
     version = "v0.1.2",
 )
 
 go_repo(
+    licences = ["BSD-2-Clause"],
     module = "github.com/pkg/errors",
     version = "v0.9.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/googleapis/gax-go/v2",
     version = "v2.7.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/golang/groupcache",
     version = "v0.0.0-20210331224755-41bb18bfe9da",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "google.golang.org/grpc/cmd/protoc-gen-go-grpc",
     version = "v1.1.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/golang/protobuf",
     version = "v1.5.3",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/sync",
     version = "v0.1.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/dustin/go-humanize",
     version = "v1.0.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/mod",
     version = "v0.5.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/googleapis/enterprise-certificate-proxy",
     version = "v0.2.3",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/peterebden/ar",
     version = "v0.0.0-20181115090543-a0ae3a11a518",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "cloud.google.com/go",
     version = "v0.65.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "cloud.google.com/go/compute/metadata",
     version = "v0.2.3",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/mattn/go-colorable",
     version = "v0.1.13",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/peterebden/go-deferred-regex",
     version = "v1.0.0",
 )
 
 go_repo(
+    licences = ["MPL-2.0"],
     module = "github.com/hashicorp/errwrap",
     version = "v1.1.0",
 )
 
 go_repo(
+    licences = ["BSD-2-Clause"],
     module = "github.com/karrick/godirwalk",
     version = "v1.16.1",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/beorn7/perks",
     version = "v1.0.1",
 )
 
 go_repo(
+    licences = ["LGPL-3.0"],
     module = "github.com/juju/ansiterm",
     version = "v0.0.0-20210706145210-9283cdf370b5",
 )
 
 go_repo(
+    licences = ["ISC"],
     module = "github.com/davecgh/go-spew",
     version = "v1.1.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/sys",
     version = "v0.13.0",
 )
 
 go_repo(
-    module = "github.com/shurcooL/sanitized_anchor_name",
-    version = "v1.0.0",
-)
-
-go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/peterebden/tools",
     version = "v0.0.0-20190805132753-b2a0db951d2a",
 )
 
 go_repo(
+    licences = [
+        "Apache-2.0",
+        "CC-BY-SA-4.0",
+    ],
     module = "github.com/opencontainers/go-digest",
     version = "v1.0.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "google.golang.org/grpc",
     version = "v1.53.0-dev",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/sourcegraph/jsonrpc2",
     version = "v0.1.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/xerrors",
     version = "5ec99f83aff198f5fbd629d6c8d8eb38a04218ca",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/cespare/xxhash/v2",
     version = "v2.2.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/googlecodelabs/tools/claat",
     version = "v0.0.0-20210914205149-d1177395e3b8",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/klauspost/cpuid/v2",
     version = "v2.0.12",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/gogo/protobuf",
     version = "v1.3.2",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/stretchr/objx",
     version = "v0.3.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/bazelbuild/remote-apis-sdks",
     version = "v0.0.0-20221114180157-e62cf9b8696a",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/alessio/shellescape",
     version = "v1.4.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/crypto",
     version = "v0.14.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "google.golang.org/protobuf",
     version = "v1.30.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/golang/glog",
     patch = ["glog_disable.patch"],
     version = "v0.0.0-20160126235308-23def4e6c14b",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/sourcegraph/go-lsp",
     version = "v0.0.0-20200429204803-219e11d77f5d",
 )
 
 go_repo(
+    licences = ["BSD-2-Clause"],
     module = "github.com/pkg/xattr",
     version = "v0.4.4",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "cloud.google.com/go/iam",
     version = "v0.10.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "go.uber.org/automaxprocs",
     version = "v1.4.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/pmezard/go-difflib",
     version = "v1.0.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "gopkg.in/square/go-jose.v2",
     requirements = ["golang.org/x/crypto"],
     version = "v2.6.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/prometheus/common",
     version = "v0.37.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/titanous/rocacheck",
     version = "v0.0.0-20171023193734-afe73141d399",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "google.golang.org/api",
     version = "v0.109.0",
 )
 
 go_repo(
+    licences = ["MPL-2.0"],
     module = "github.com/hashicorp/go-cleanhttp",
     version = "v0.5.2",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "go.opencensus.io",
     version = "v0.24.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "cloud.google.com/go/longrunning",
     version = "v0.4.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/prometheus/procfs",
     version = "v0.8.0",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/manifoldco/promptui",
     version = "v0.8.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "sourcegraph.com/sqs/pbtypes",
     version = "v0.0.0-20180604144634-d3ebe8f20ae4",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/google/uuid",
     version = "v1.3.0",
 )
 
 go_repo(
+    licences = ["MPL-2.0"],
     module = "github.com/letsencrypt/boulder",
     version = "v0.0.0-20221109233200-85aa52084eaf",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "github.com/fsnotify/fsnotify",
     version = "v1.5.1",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/bazelbuild/remote-apis",
     version = "v0.0.0-20210718193713-0ecef08215cf",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "go.starlark.net",
     version = "v0.0.0-20210901212718-87f333178d59",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "cloud.google.com/go/kms",
     version = "v1.8.0",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/sourcegraph/go-diff",
     version = "v0.6.1",
 )
 
 go_repo(
+    licences = ["BSD-3-Clause"],
     module = "golang.org/x/exp",
     version = "v0.0.0-20230116083435-1de6713980de",
 )
 
 go_repo(
+    licences = ["MIT"],
     module = "github.com/jstemmer/go-junit-report/v2",
     version = "v2.0.0",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "cloud.google.com/go/compute",
     version = "v1.18.0",
 )
 
 go_repo(
-    module = "github.com/StackExchange/wmi",
-    version = "v1.2.1",
-)
-
-go_repo(
+    licences = ["MIT"],
     module = "github.com/go-ole/go-ole",
     version = "v1.2.5",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "google.golang.org/appengine",
     version = "v1.6.7",
 )
 
 go_repo(
+    licences = ["Apache-2.0"],
     module = "github.com/please-build/buildtools",
     version = "v0.0.0-20231122153602-22bdf3fe4f1d",
 )