French to English Bus/Financial Finance (general) Employee Stock options

This is taken from a document advising employees of their rights in terms of exercising their stock options in connection with the Company Savings Scheme.
I think I know what this is saying (see below the French text) but want to be absolutely sure, as I got a bit bogged down with it in the middle. It's the bit between the ** to which I refer.

Conformément aux textes en vigueur, seuls les avoirs indisponibles acquis dans le cadre d’un PEE peuvent servir à la souscription ou l’achat d’actions issues de stock-options.
Les actions ainsi acquises sont impérativement bloquées 5 ans dans un « compartiment spécial » du PEE **sans bénéfice possible des cas de déblocage anticipé prévus par la réglementation applicable au PEE **, hormis le décès du bénéficiaire.
La Liquidation des avoirs figurant au sein d’un PEE pour lever des options sur Titres correspondante à la délivrance des sommes rend exigible les prélèvements sociaux de 11% sur le gain net réalisé.

I think it is saying that shares acquired in this way are frozen for 5 years in a special compartment of the CSS, without the possibility of making any profit (?) if they are 'unfrozen' early (i.e. before the 5 years are up), as provided for in the rules applying to the CSS...except in the case of the beneficiary's death?

Everything else is quite straightforward in the text - it was just this bit that confused me slightly, so any expert input would be appreciated (as ever). Thanks in advance.