US 12,462,001 B2
Digital watermarking in a content delivery network
Andrew Gerrie, Middlesex (GB)
Assigned to Sky CP Limited, Middlesex (GB)
Appl. No. 17/916,465
Filed by Sky CP Limited, Middlesex (GB)
PCT Filed Mar. 29, 2021, PCT No. PCT/GB2021/050776
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/198669, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2004941 (GB), filed on Apr. 3, 2020.
Prior Publication US 2023/0141582 A1, May 11, 2023
Int. Cl. G06F 21/16 (2013.01); G06F 21/60 (2013.01); H04N 21/2187 (2011.01); H04N 21/2347 (2011.01); H04N 21/8358 (2011.01); G06F 21/10 (2013.01)
CPC G06F 21/16 (2013.01) [G06F 21/602 (2013.01); H04N 21/2187 (2013.01); H04N 21/23476 (2013.01); H04N 21/8358 (2013.01); G06F 21/1063 (2023.08)] 15 Claims
OG exemplary drawing
 
1. A method of digital watermarking at a content distribution network (CDN) node, the method comprising:
receiving, from an origin server, source data intended for at least one recipient, the source data including a plurality of encrypted segments interleaved with at least one non-encrypted segment;
detecting metadata in the source data, the metadata identifying the, or each, non-encrypted segment;
in response to detecting metadata identifying a non-encrypted segment, modifying the source data for the, or each, recipient, by embedding a recipient-specific digital watermark to at least a portion of a non-encrypted segment in the source data; and
transmitting the modified source data to the, or each respective, recipient.