[Sony Xperia P, U, Sola, Go] pcarvalho:
000007E9 contains this: (taken from a random ta file i have)

tributeValue>urn:marlin:core:role:drm-client</AttributeValue></Attribute><Attribute AttributeName="version-major" AttributeNamespace="urn:marlin:core"><AttributeValue xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:nonNegativeInteger">1</AttributeValue></Attribute><Attribute AttributeName="version-minor" AttributeNamespace="urn:marlin:core"><AttributeValue xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:nonNegativeInteger">3</AttributeValue></Attribute><Attribute AttributeName="trusted-time" AttributeNamespace="urn:marlin:core:client:capabilities"><AttributeValue></AttributeValue></Attribute><Attribute AttributeName="version-major" AttributeNamespace="urn:marlin:broadband"><AttributeValue xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:nonNegativeInteger">1</AttributeValue></Attribute><Attribute AttributeName="version-minor" AttributeNamespace="urn:marlin:broadband"><AttributeValue xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:nonNegativeInteger">2</AttributeValue></Attribute><Attribute AttributeName="manufacturer" AttributeNamespace="urn:marlin:broadband:client"><AttributeValue>urn:marlin:organization:semc</AttributeValue></Attribute></AttributeStatement><Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></CanonicalizationMethod><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"></SignatureMethod><Reference URI="#AQAEQFEZ"><Transforms><Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"></Transform><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></Transform></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"></DigestMethod><DigestValue>5xG8cmniwCOg3gAHQ9pClfIKRK0=</DigestValue></Reference></SignedInfo><SignatureValue>CcxOuG7FMEob+gGVUNoXQ9U8hIRdpJIj3RCcs8utRrhW1IqY6BS7/H9mktkJYZ35GQ/47HB4mnBO
rtstmH4CjwUP5eiVI2uu/8VMiff6Xbj+wvp72asFlR0o5k2y7zWBqU48Fy9BXLjIFNCVPBLJ5LYT
d+cC11alsC/oXJqCi71Dm228BdEblP2igs+mE7lQpAeC+/ftn2M2NzZw2evgzR5yCbmnd+ObWVcL
Cgjq72AqfzdbkUrx+vFVrKzWj71Q4qYRV+/VIT3aKrExQh1v776VOSW+eFX/8KVsfk4pgahWn4HZ
OayTsYLYa8SxffWhBCZr3Q4ipASEE3PWrTr/Xg==</SignatureValue><KeyInfo><X509Data><X509Certificate>MIIECDCCAvCgAwIBAgIIQ0TOnbQnIMcwDQYJKoZIhvcNAQELBQAwOTE3MDUGCysGAQQBgbkvAQEB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</X509Certificate><X509Certificate>MIID1jCCAr6gAwIBAgIIK20bnobMZVkwDQYJKoZIhvcNAQEFBQAwKTEnMCUGCysGAQQBgbkvAQEB
DBZ1cm46bWFybGluOmRybXNlcnZpY2VzMB4XDTA3MTExMzAwMTczMFoXDTI3MTExMzAwMTczMFow
OTE3MDUGCysGAQQBgbkvAQEBDCZ1cm46bWFybGluOm9yZ2FuaXphdGlvbjpzZWFjZXJ0OmRybXN2
YzCCASAwDQYJKoZIhvcNAQEBBQADggENADCCAQgCggEBAMbZ2VIP7pm+V4+4QwcvVYU64nzNXG+W
YT4uuJgm2yMbnJHauRG4zHrmQuEh+4mqiYuGWooAD8EDG

and it goes on untill 000007EC

my best guess is DRM is stored from 000007E6 to 000007EC

000007E6 and 000007E7 seem to be unique per device as 000007DA is

since only 2 new keys are added DRM's are still there, but probably are ignored after unlock...

000008B3 does change but i dont know what it means

some devices have 000008B3 0004 50 00 00 00 when unlocked

as i said this is just a theory...

cheers