diff --git a/meta/classes/copyleft_compliance.bbclass b/meta/classes/copyleft_compliance.bbclass
new file mode 100644
index 0000000..907c183
--- /dev/null
+++ b/meta/classes/copyleft_compliance.bbclass
@@ -0,0 +1,64 @@
+# Deploy sources for recipes for compliance with copyleft-style licenses
+# Defaults to using symlinks, as it's a quick operation, and one can easily
+# follow the links when making use of the files (e.g. tar with the -h arg).
+#
+# vi:sts=4:sw=4:et
+
+inherit copyleft_filter
+
+COPYLEFT_SOURCES_DIR ?= '${DEPLOY_DIR}/copyleft_sources'
+
+python do_prepare_copyleft_sources () {
+    """Populate a tree of the recipe sources and emit patch series files"""
+    import os.path
+    import shutil
+
+    p = d.getVar('P', True)
+    included, reason = copyleft_should_include(d)
+    if not included:
+        bb.debug(1, 'copyleft: %s is excluded: %s' % (p, reason))
+        return
+    else:
+        bb.debug(1, 'copyleft: %s is included: %s' % (p, reason))
+
+    sources_dir = d.getVar('COPYLEFT_SOURCES_DIR', True)
+    dl_dir = d.getVar('DL_DIR', True)
+    src_uri = d.getVar('SRC_URI', True).split()
+    fetch = bb.fetch2.Fetch(src_uri, d)
+    ud = fetch.ud
+
+    pf = d.getVar('PF', True)
+    dest = os.path.join(sources_dir, pf)
+    shutil.rmtree(dest, ignore_errors=True)
+    bb.utils.mkdirhier(dest)
+
+    for u in ud.values():
+        local = os.path.normpath(fetch.localpath(u.url))
+        if local.endswith('.bb'):
+            continue
+        elif local.endswith('/'):
+            local = local[:-1]
+
+        if u.mirrortarball:
+            tarball_path = os.path.join(dl_dir, u.mirrortarball)
+            if os.path.exists(tarball_path):
+                local = tarball_path
+
+        oe.path.symlink(local, os.path.join(dest, os.path.basename(local)), force=True)
+
+    patches = src_patches(d)
+    for patch in patches:
+        _, _, local, _, _, parm = bb.fetch.decodeurl(patch)
+        patchdir = parm.get('patchdir')
+        if patchdir:
+            series = os.path.join(dest, 'series.subdir.%s' % patchdir.replace('/', '_'))
+        else:
+            series = os.path.join(dest, 'series')
+
+        with open(series, 'a') as s:
+            s.write('%s -p%s\n' % (os.path.basename(local), parm['striplevel']))
+}
+
+addtask prepare_copyleft_sources after do_fetch before do_build
+do_prepare_copyleft_sources[dirs] = "${WORKDIR}"
+do_build[recrdeptask] += 'do_prepare_copyleft_sources'