$ find owncloud -name signature.json

owncloud/apps/activity/appinfo/signature.json
owncloud/apps/comments/appinfo/signature.json
owncloud/apps/dav/appinfo/signature.json
owncloud/apps/encryption/appinfo/signature.json
owncloud/apps/external/appinfo/signature.json
owncloud/apps/federatedfilesharing/appinfo/signature.json
owncloud/apps/federation/appinfo/signature.json
owncloud/apps/files/appinfo/signature.json
owncloud/apps/files_external/appinfo/signature.json
owncloud/apps/files_pdfviewer/appinfo/signature.json
owncloud/apps/files_sharing/appinfo/signature.json
owncloud/apps/files_texteditor/appinfo/signature.json
owncloud/apps/files_trashbin/appinfo/signature.json
owncloud/apps/files_versions/appinfo/signature.json
owncloud/apps/files_videoplayer/appinfo/signature.json
owncloud/apps/firstrunwizard/appinfo/signature.json
owncloud/apps/gallery/appinfo/signature.json
owncloud/apps/notifications/appinfo/signature.json
owncloud/apps/provisioning_api/appinfo/signature.json
owncloud/apps/systemtags/appinfo/signature.json
owncloud/apps/templateeditor/appinfo/signature.json
owncloud/apps/updatenotification/appinfo/signature.json
owncloud/apps/user_external/appinfo/signature.json
owncloud/apps/user_ldap/appinfo/signature.json
owncloud/core/signature.json