DICOM has a Patent Disclosure Policy as described in Section 9 of the Governance.
The policy requires organizations to submit a signed Declaration when applying to become a member agreeing to abide by the policy.
The copyright for the DICOM Standard is held by the National Electrical Manufacturers Association on behalf of the DICOM Standards Committee.
No license is required to download or implement the DICOM Standard.
Requests for permission to reproduce the DICOM Standard may be submitted to the DICOM Secretariat (firstname.lastname@example.org) for consideration by the DICOM Standards Committee.