Can you explain these parameters in this direct YT download links

[Waffa]

Greetings, i posted a question on http://forum.videohelp.com/threads/3...51#post2396551 about explenation of all the parameters (how they are sometimes, sometimes not) in the URL.

Greetings fellow members, can You break it down to me, all the parameters of these Youtube direct download links, 
and help to combine  direct links that are not time expired (these work for few days, the Goo.gl link is direct download working url).

One wish is to get URLs work, but also want to know the reasons and meaning of (why) all the  these parameters are on different videos, where they come from.  

Links are made with same Yt downloader, just with a month a part.  Many parts can be removed from URL, but what and why. 
If you know better forum to also post that link (more related to webtec perhaps, let me know)

Update: Now only the first URL works, others stopped download after few clicks. Other times they worked for many clicks for days, posted old links also to compare, that i used before  Hilighted the similar parts, for more easy viewing. 
fresh: https://goo.gl/wvxsCo 
https://r18---sn-i5h7ln7s.googlevide...videoplayback?itag=18&requiressl=yes&ipbits=0&initcwndbps=982500&pl=23&fexp=930827,9407141,9407535,9407713,9408142,9408420,9408710,9409170,9410773,9412958,9413503,9415304,9416126,9416329,9416456,952640&key=yt5&upn=glRoyFGA0ec&ratebypass=yes&mm=31&lmt=1411065252274357&expire=1435166991&mn=sn-i5h7ln7s&mt=1435145272&mv=m&ms=au&ip=217.71.46.107&source=youtube&sver=3&mime=video/mp4&signature=B31CDB6BF6F394517625654F83D226EE41CBAE0D.1F181620CB4BDE450187E89F5F18E5546FA7EC9B&dur=1153.102&id=o-AOYJ9JCS9QUyLk_9mGm6PSqiCis8R3J21PutrGKSWNK4&sparams=dur,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pl,ratebypass,requiressl,source,upn,expire&title=Seenekas%20Allarile%20Nature%20and%20Life,%20Open%20Source%20Human%20clips
expired:
https://r2---sn-4g57kuek.googlevideo.com/videoplayback?sver=3&upn=16Q_Tcw2nVI&requiressl=yes&dur=1153.102&ip=217.71.47.125&id=o-AACaLIY74_LyanCZexuZDKDXDZkFiNYojferc3m14alK&ipbits=0&fexp=916723,930827,9406989,9408142,9408710,9413503,9415304,952612,957904&itag=18&sparams=dur,expire,id,initcwndbps,ip,ipbits,itag,mime,mm,mn,ms,mv,pl,ratebypass,requiressl,source,upn&ratebypass=yes&signature=35214992C3EF424735A867CD86E388D686FAF8C2.22EE9551CDC0C315E4C18BDF02562A66CD631798&source=youtube&mime=video/mp4&pl=23&key=cms1&expire=1433031302&title=Seenekas%20Allarile%20Nature%20and%20Life,%20Open%20Source%20Human%20clips&redirect_counter=1&req_id=dd03f9f1f56ba3ee&cms_redirect=yes&mm=26&mn=sn-4g57kuek&ms=tsu&mt=1433009716&mv=m

FresH: https://goo.gl/jwlMx3
https://r19---sn-i5h7ln7d.googlevide...videoplayback?ms=au&fexp=930827,9407141,9407535,9407713,9408142,9408420,9408710,9409170,9410773,9412958,9413503,9415304,9416126,9416329,9416456,952640&mv=m&mt=1435145537&dur=5375.535&ratebypass=yes&upn=zmENgUbJFsM&mn=sn-i5h7ln7d&mm=31&source=youtube&signature=DC335A3BCDCDC3AC0673ABCF111D3AE3E17EDF85.719FBBA50A9A0D980E20B24582777F1760CA4536&lmt=1401350890138699&ipbits=0&key=yt5&itag=18&mime=video/mp4&requiressl=yes&pl=23&expire=1435167205&initcwndbps=963750&sparams=dur,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pl,ratebypass,requiressl,source,upn,expire&sver=3&id=o-AE3JTdNMgjXdXBspr5-B_sWgaA_mx9IUeS2KMGfQYtej&ip=217.71.46.107&title=J%C3%BCri%20Rumm%20m_f%201994,%20lavastaja%20Jaan%20Kolberg
expired:
https://r19---sn-i5h7ln7d.googlevide...videoplayback?ipbits=0&sparams=dur,id,initcwndbps,ip,ipbits,itag,mime,mm,ms,mv,pl,ratebypass,requiressl,source,upn,expire&signature=29B03761AB63074A4B92264A8C565A91061CDCEE.121861B3F67F510CDDABA694ADDEB04BA8312092&upn=BBRRBR8DUhg&pl=23&itag=18&mime=video/mp4&fexp=916723,930827,9407535,9407713,9407898,9408084,9408142,9408710,9409170,9410773,9412958,9413503,9415304,9415351,948124,952612&mm=31&ratebypass=yes&requiressl=yes&ms=au&mt=1432586661&mv=m&dur=5375.535&expire=1432608388&key=yt5&ip=217.71.46.183&sver=3&id=o-AC19SOjaMoHHf8LLdsU6kzwR9lfDHpP7cf3gjz9lZjVS&source=youtube&initcwndbps=1047500&title=J%C3%BCri%20Rumm%20m_f%201994,%20lavastaja%20Jaan%20Kolberg

fresh: 	https://www.goo.gl/Z3mD4v
https://r7---sn-4g57kues.googlevideo.com/videoplayback?sparams=dur,expire,gcr,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pl,ratebypass,requiressl,source,upn&sver=3&requiressl=yes&key=cms1&upn=0Bg09fb-h4s&lmt=1390119880708306&expire=1435167761&itag=18&ipbits=0&ip=217.71.46.107&mime=video/mp4&signature=063EF2373575816A1736ADA1C68033FA14DB2364.142C159C73F3A17B870B66BCC15BF72D1A296068&source=youtube&id=o-AOooJLEwCPeHvWrClwtiRtphW1TFGOYwcIC7c1x16--4&pl=23&dur=6629.854&fexp=930827,9407141,9407535,9407713,9408142,9408420,9408710,9409170,9410773,9412958,9413503,9415304,9416126,9416329,9416456,952640&ratebypass=yes&gcr=ee&title=Nineteen%20Eighty-Four%201984%20to%20Richard%20Burton,%20George%20Orwell&redirect_counter=1&req_id=cad6a9d94864a3ee&cms_redirect=yes&mm=26&mn=sn-4g57kues&ms=tsu&mt=1435146142&mv=m
expired:
https://r7---sn-4g57kues.googlevideo.com/videoplayback?itag=18&source=youtube&mime=video/mp4&ip=217.71.47.172&pl=23&signature=427A48DC324531218760E0AE90BA39F7D506B8F0.1D0E64D4356F8934ADBFF0D92AFAF9DE55619A9C&expire=1432604651&ipbits=0&requiressl=yes&sparams=dur,expire,gcr,id,initcwndbps,ip,ipbits,itag,mime,mm,mn,ms,mv,pl,ratebypass,requiressl,source,upn&gcr=ee&upn=coIN2XQ3qfI&id=o-AECTd0Mug2nMnRyB9wMqN0f265QFtZ-Y5RKuP1TeZlw-&key=cms1&dur=6629.854&sver=3&fexp=916723,930827,9407535,9407713,9407898,9408084,9408142,9408710,9409170,9410773,9412958,9413503,9415304,9415351,948124,952612&ratebypass=yes&title=Nineteen%20Eighty-Four%201984%20to%20Richard%20Burton,%20George%20Orwell&redirect_counter=1&req_id=e4bc918b8725a3ee&cms_redirect=yes&mm=26&mn=sn-4g57kues&ms=tsu&mt=1432583127&mv=m

What is the logic, that sometimes there is one options,another tiems so much different. 
It has downloader IP in but it workd from other IPs also, with no cookies, tested.

Also solves one other user problem perhaps: http://forum.videohelp.com/threads/3...ownload-button