Revert "Update license.txt"

This reverts commit 6768d242570e1f7cef6829b463f957adbeab55d2.
Revert "Remove licence text"

This reverts commit 758b2f8f3820ad62b7eefd76b61a31daa322e5e4.
Revert "Remove licence"

This reverts commit a73adedf3afe9d211d378374a4bc0ff059a6565a.