1. A method of processing digital content, the method comprising the steps, in a device comprising a processor, of:
receiving a content scrambled using a control word;
receiving, via a user interface, a user identifier and a user code;
processing the user identifier and the user code to obtain the control word;
descrambling the scrambled content using the control word;
inserting into the descrambled content a watermark based on the user identifier; and
outputting the watermarked content.
2. A method of processing digital content, the method comprising the steps, in a device comprising a processor, of:
receiving a content scrambled using a control word;
receiving, via a user interface, a text string;
processing the text string to obtain the control word and a user identifier;
descrambling the scrambled content using the control word;
inserting into the descrambled content a watermark based on the user identifier; and
outputting the watermarked content.
3. The method of claim 10, wherein the intermediate code is obtained solely from the text string.
4. The method of claim 1, wherein the watermark is an invisible watermark.
5. The method of claim 1, further comprising the step of inserting the user identifier as a visible watermark.
6. A device for processing digital content, the device comprising a processor to:
receive a content scrambled using a control word;
receive, via a user interface, a user identifier and a user code;
process the user identifier and the user code to obtain the control word;
descramble the scrambled content using the control word;
insert into the descrambled content a watermark based on the user identifier; and
output the watermarked content.
7. A device for processing digital content, the device comprising a processor configured to:
receive a content scrambled using a control word;
receive, via a user interface, a text string;
process the text string to obtain the control word and a user identifier;
descramble the scrambled content using the control word;
insert into the descrambled content a watermark based on the user identifier; and
output the watermarked content.
8. A method of generating a user code for accessing digital content, the method comprising the steps, in a device comprising a processor, of:
receiving a control word used to scramble the digital content;
receiving an identifier for a user;
generating an intermediate code from at least the control word and the identifier for the user;
generating a text string from the intermediate code; and
outputting the text string.
9. A device for generating a user code for accessing digital content, the device comprising a processor configured to:
receive a control word used to scramble the digital content;
receive an identifier for a user;
generate an intermediate code from at least the control word and the identifier for the user;
generate a text string from the intermediate code; and
output the text string.
10. The method of claim 2, wherein the processing step comprises:
processing the text string to obtain an intermediate code; and
processing the intermediate code to obtain the control word and a user identifier.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A lubricating oil additive composition consisting of:
a compound (A) represented by formula (1),
wherein R1 and R4 each independently represent a hydrocarbon group having 6 to 18 carbon atoms, and R2 and R3 each independently represent an alkylene group having 1 to 4 carbon atoms, and
a compound (B) represented by formula (2),
wherein R5 represents a hydrocarbon group having 6 to 18 carbon atoms, and R6 and R7 each independently represent an alkylene group having 1 to 4 carbon atoms,
and having an acid value of 0.01 to 0.4 mgKOHg.
2. The lubricating oil additive composition according to claim 1, wherein each of R2, R3, R6, and R7 is an ethylene group and R1, R4, and R5 are the same group.
3. The lubricating oil additive composition according to claim 1, wherein the acid value is from 0.01 to 0.3 mgKOHg.
4. A method for improving the storage stability of a lubricating oil additive composition comprising:
adjusting an acid value of a lubricating additive composition consisting of:
a compound (A) represented by formula (1),
wherein R1 and R4 each independently represent a hydrocarbon group having 6 to 18 carbon atoms, and R2 and R3 each independently represent an alkylene group having 1 to 4 carbon atoms, and
a compound (B) represented by formula (2),
wherein R5 represents a hydrocarbon group having 6 to 18 carbon atoms, and R6 and R7 each independently represent an alkylene group having 1 to 4 carbon atoms,
to 0.01 to 0.4 mgKOHg.
5. The lubricating oil additive composition according to claim 2, wherein the acid value is from 0.01 to 0.3 mgKOHg.