I a mixture of curiosity and paranoia, I decided to run a HDD monitor (Disk Pulse) to see what files were accessed, as I assumed the access being requested would involve some kind of file operation.
The below shows the list of files accessed, starting right after I clicked Allow.
Code:
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\CacheWritableAdobeRoot\0\Flash_Player\gss.dat
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\CacheWritableAdobeRoot\0\Flash_Player\gss.lkg
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\2971.tmp
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\2971.tmp
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Local State~RF4b2293a.TMP
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\2971.tmp
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Local State~RF4b2293a.TMP
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\2971.tmp
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\CacheWritableAdobeRoot\0\Flash_Player\-OhPvYAKNaopVSfii9bFsOTspfw=\sss.lkg
C:\Users\%USER%\AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-21-4095476410-4007890272-2945713077-1000\c74c6f795ada87022536668c055d2c0e_9da9ad74-9576-4d84-bbf0-b6f0702af973
C:\Users\%USER%\AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-21-4095476410-4007890272-2945713077-1000\c74c6f795ada87022536668c055d2c0e_9da9ad74-9576-4d84-bbf0-b6f0702af973
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Sync Data\SyncData.sqlite3-journal
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Sync Data\SyncData.sqlite3
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Sync Data\SyncData.sqlite3-journal
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com\_ggMCvar_1.sxx
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com\_ggMCvar_1.sxx
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com\_ggMCvar_1.sol
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com\_ggMCvar_1.sxx
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com\_ggMCvar_1.sol
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com
C:\Users\%USER%\AppData\Local\Google\Chrome\User Data\Default\Pepper Data\Shockwave Flash\WritableRoot\#SharedObjects\8XCDB5JG\secure-uk.imrworldwide.com\_ggMCvar_1.sol
The first thing to raise suspicions is the domain "secure-uk.imrworldwide.com". I did a search around about this and basically they're a company that track your online activity in order to provide that information to advertisers.
I don't know if the request for access was directly related to this or not, but it seems quite clear that there is tracking software embedded within the 4oD video player...
It seems it's less about whether I trust Adobe, more about whether I trust Channel 4 and the companies they decide to partner with.