Security: Malformed: Privatetag Aligned

The ICC specification lists the required and optional tags for each of the profile classes. Profile creators may also include other tags, but to avoid clashes such tags should be listed in the Private and ICC Tag and CMM Registry, available from the Signature Registry page https://www.color.org/signatures2.xalter

Any tags which are not defined in the profile version to which a profile conforms can be considered to be private.

ICC recommends that private tags are not included in a profile, and that any private tags do not include CMM-dependent processing elements.

The profile privatetag-aligned.icc includes a private tag with signature 'pdf ', which is not a registered tag.

This profile can be used to test that a CMM or application can ignore an unregistered private tag.